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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.myfaces.orchestra.viewController;
21  
22  /**
23   * Invokes ViewController events using the {@link ViewController} interface.
24   * <p>
25   * This requires that beans implement the ViewController interface in order
26   * to receive view lifecycle events.
27   * <p>
28   * Other implementations are possible that do not require a bean to implement a
29   * specific interface; see ReflectiveViewControllerExecutor for one example.
30   * <p>
31   * Note that each method here returns false if the target bean does not
32   * implement the ViewController interface; this allows this executor to 
33   * be "chained" with others.
34   */
35  public class InterfaceViewControllerExecutor extends AbstractViewControllerExecutor
36  {
37      public boolean invokeInitView(String beanName, Object bean)
38      {
39          if (bean instanceof ViewController)
40          {
41              ((ViewController) bean).initView();
42              return true;
43          }
44          return false;
45      }
46  
47      public boolean invokePreRenderView(String beanName, Object bean)
48      {
49          if (bean instanceof ViewController)
50          {
51              ((ViewController) bean).preRenderView();
52              return true;
53          }
54          return false;
55      }
56  
57      public boolean invokePreProcess(String beanName, Object bean)
58      {
59          if (bean instanceof ViewController)
60          {
61              ((ViewController) bean).preProcess();
62              return true;
63          }
64          return false;
65      }
66  }